Filter for plate-type heat exchange apparatus



Oct. 10, 1950 R. sELlGMAN E-rAL 2,525,000

FILTER FOR PLATE-TYPE HEAT EXCHANGE APPARATUS Filed Nov. 20, 1945 5 Sheets-Sheet 1 Oct. 10, 1950 R; sELlGMAN ETAL 2,525,000

FILTER FOR PLATE-TYPE HEAT EXCHANGE APPARATUS Filed Nov. 20, 1945 5 Sheets-Sheet 2 Oct' 10, 195.0 R. sELlGMAN r-:TAL 2,525,000

FILTER FOR PLATE-TYPE HEAT EXCHANGE APPARATUS Filed Nov. 20, 1945 5 Sheets-Sheet 5 Oct. 10, 1950 R. sELlGMAN Erm. 2,525,000

FILTER FoR PLATE-TYFF HEAT EXCHANGE APPARATUS l Filed Nov. 2o. 1945 5 sheets-sheet 4 62 3f TI l l 1 illy F QF

INVETOM @www Awa-MAN R. slsLlcswmmV Erm., 2,525,000 FILTER FOR PLATE-TYPE HEAT EXCHANGE APPARATUS Filed Nov. 2o.` 1945 oct. 10,'1950 5 Sheets-Sheet 5 INVENTORS mea 5E-awww M14/HF' @nana/u wffamm Patented Oct. 10, 1950 FILTER FOR PLATE-TYPE HEAT EXCHANGE APPARATUS Richard Seligman and Hugh Frederick Goodman, Wandsworth, London, England, assignors to The Aluminium Plant & Vessel Company, Limited, London, England, a British company Application November 20, 1945, Serial No. 629,746 In Great Britain September 14, 1944 Section 1, Public Lawr690, August 8, 1946 Patent expires September 14, 1964 1 Claim.

This invention relates to plate-type heat eX- change apparatus of the type that is made up of a plurality of juxtaposed plates or elements arranged side by'side to provide passages for the iiow of the fluid media between' which heat is to be exchanged and more particularly to ltering apparatus 4for incorporation in heat exchange apparatus of the type referred to. y

V 'it has been found that certain liquids such as arranged side by side or otherwise and provided with means for enabling the now to be directed either through both of them or through either oi them so that whilst one'is in use the other may be examined or cleaned Without interrupting or disturbing the operation of the other parts of the plant.

The filtering components may be of any desired form and each of them may be adapted te be conmilk lter much more quickly and satisfactorily nected with the flow line by suitable means such when hot than when cold. For instance, hot milk as one or more manually operable valves arranged will pass through a given cloth lter many more in position in the inlet to, and/or the outlet from, times faster than will the same milk while cold. the filtering unit. v Also, cold milk will orten clog up a'iilter. In the In some instances, the nltering components handling and treatingof milk in the pasteurizing l5 may be inthe form of elongated cylindrical memthereoi, the milk is brought in heat exchange bers provided with stocking-like nltering elerelation with a heating medium after being ments or cloths which, if desired, may loe provided passed in heat exchange relation with previously with means for causing the same to assume a heated milk to cool the latter and preheat the concertina-like or zig-zag form in cross section former. Plate-type heat exchangers are Widely or to be provided with a re-entrant portion. The employed for this purpose and according to the member supporting the ltering element or elepresent invention, a nlter is inserted in the stack ments may be inthe fOlm 0f a nelfOlateCl Cylinder of heat exchange plates to lter the liquid while or two concentric cylinders. it is in theportion of the stack of plates'where It is to be understood that the lilter may be it is hot. 25 disposed or inserted at any point in the heat exvOne object of `the invention is to provide an changer so as to secure ltration at any temmproved iormof such a filtering apparatus for perature within the range of the machine and the iiltering ofV milk and other potable liquids. should, therefore, conform to the generalstruc- Another object of the invention is to provide ture of the machine. an improved form of plate-type heat exchanger In order that the said invention may be clearly having such a filtering apparatus or unit incorunderstood and readily carried into effect, the prorated therein. same will novv be more fully described with ref- According to one Yfeature of the invention there erence to the accompanying drawings in which: is provided an improved form or" filtering unit Fig. l is a side view, partly in section, of one which is adapted for incorporation in a plate type form of the improved formY of filtering unit proheat exchanger and which compris-es a pair of duced according to the invention; iiltering elements or chambers so arranged that Fig. 2 S a Side View 0f the Same; both ofthem may be used together or either of Fs- 3 is a plan View partly in section; and them may be in use whilst the other is discon- Fig. 4 is a fragmentary View showing the door nested from circuit for cleaning, inspection o-r 1m 0f the unil? Open and One 0f the llelllg COmpO- other purposes, nents being swung outwardly through the open- According to another feature of the invention ing for inSDeCOIhCleaDng, tng of another there is provided a plate-type heat exchanger'l filter Cloth O1" other lJuYDOSeS having incorporated therein a iilteringunit com- Fig. 5 is a side elevational View of a plate-type prising a pair of filtering elements or chambers heat exchanger embodying the features of the with which are associated means for enabling present invention.l A either to be disconnected from circuitlas, for ex- Fig. 6 is a fragmentary. perspective exploded ample, for cleaning or inspection. view of a heat exchanger including the features In the preferred form of the invention, theim of the presentinvention. proved form of iiltering unit vis constructed and The mpIOl/ed ltel' mit illustrated Il the ae formed so that it constitutes a self-contained companying drawings comprises an outer casing unit which is adapted for incorporation in an l which is generally oi rectangular form in cross assembly ofplates forming part of a plate-type section and is providedwith sidewalls 2 and 3 heat exchanger and' is'made up of two separate Whichare paralleli and substantially fiat so that or separated ltering components or chambers theunit may be incorporated or fitted in a stack 3 of heat exchange plates 60a, 60h, 60o, etc., forming part of a plate-type heat exchanger 6I at a definite point where the inlet and outlet ports of the filter unit will properly register with the ports of adjacent heat exchange plates. At its upper end, the unit is formed with a pair of upwardly extending brackets 4 and 5 which are spaced apart and which serve to support pins 6 forming journals for rollers 'I by which the unit is supported for lateral displacement along an overhead bar 62 which also serves to support the heat exchanger plates 65. The unit is traversed by plates IU in cruciform arrangement.

The casing contains two filtering chambers I2 and I4, the arrangement being such that the front of the chamber I2 is adapted to be closed by a double walled door I hinged at I5a and controllable by screw clamps I5b, while the front of the chamber I4 is adapted to be closed by another hinged door of like form shown at I6. At its lower end, the casing I is provided with a header block I8 in which are cast passages for the flow of the milk and, at its upper end, there is arranged another header block I9 also having passages cast therein, the latter block being provided with the aforesaid upwardly extending brackets 4 and 5 which carry the roller I.

As will be seen, the block I9 is provided with a passage 26 which extends transversely thereacross above the filtering chambers and is connected with the upper ends of the said chambers by a pair of transfer ports 22 each having seated therein one of a pair of valves 23. The valves are provided with upwardly extending valve stems 23a arranged for movement in guides orV caps .24 which are at a convenient point above the valve seats. Each valve is formed with a shoulder 25 engaged by one of a pair of pins or projections 26 which project eccentrically from the ends of a pair of horizontally arranged members or spindles 2T which are mounted for angular displacement in the opposite end walls of the block I9, the arrangement being such that each spindle is provided externally of the block with an operating handle or bar 30.

The, milk to be filtered may enter from one section 60a of the heat exchanger, say, after pre-heating, through an inlet port 32 into the transverse passage and by operating either or `both of the handles or bars 30 to raise one or both of the valves 23 it may be permitted to pass into veither or both of the filtering chambers. At its lower end each filtering chamber is provided with a vertically disposed tubular member '34, which tubular members are seated in a pair of vertical ports or openings 35 formed in the lower block I8 so that they communicate with a transverse passage 36 in such block. The passage 36 is connected with an outlet port 38 which is adapted to register with a port leading to a further section Bd of the heat exchanger and each of the ports 35 is provided with one of a pair of valves 4D. Such valves are loaded by light springs 42 so that when the pressure in the filter chamber thereabove is released the valve will close and seal the chamber from the outlet passage.

Each filtering chamber is preferably provided with a semi-cylindrical or substantially semicylindrical liner 44 bearing against plates IG (Fig. 3) to partition the casing therewith. The filtering elements within the filtering chambers preferably comprise a pair of concentric perforated tubes 46 and 41 which are spaced slightly and are arranged so that the outer tube 41 is coupled with a ring 48 which is seated in position on the upper flared end of the tubular member 34. The aforesaid tubes constitute the support for a filtering element or cloth 50 which extends over the outer surface of the outer tube 41 and along the inner surface of the inner tube 46. Preferably, the filtering cloth consists of an elongated bag or stocking-like member the open end of which is sealed or connected with the ring 48 by slipping thereover a resilient ring 52 and providing the ring 48 with an annular groove to receive said open end and resilient ring. As will be seen, the cloth extends upwardly from its open end over the outer surface of the outer tube and then downwardly along the inner surface of the inner tube and hence the liquid being filtered has to pass outwardly through one part of the filter cloth or inwardly through the other part of the filter cloth in order to pass into the annular space between the tubes 46 and 41 and thence to the outlet from the filtering chamber.

-In practice, either or both filtering chambers may be used and either may be opened up for inspection, cleaning or the changing of the filter cloth without interrupting or disturbing the operation of the other parts of the plant providing, of course, that the valve operating member 3D is actuated to close the valve 23 at the upper end of the filtering chamber which is to be opened up.

When it is required to change a filter cloth the valve 23 at the upper end" of the chamber containing the cloth is closed and the milk in the chamber is drained therefrom through a drainhole 55 which is normally closed by a plug. At the same time, a similar opening 56 at the top of the door allows the chamber to be vented and when the milk has drained away, Athe door may be opened to gain access to the filtering elements. Preferably and in order to facilitate the carrying out of the operation of removing the old or used filter cloth and fitting a new one, the filtering elements comprising the tubes 46 and 4'I, the cloth 50, the ring 48 and a support58 therefor are adapted to be swung outwardly in themanner indicated in Fig. 4. For this purpose, the support 58 may be arranged so that it is free to pivot about its lower edge, and suitable stops are preferably provided to limit the degree of outward or pivotal movement permissible.

We claim:

A filtering unit comprising a vertically extending pair of side walls in spaced parallel relationship, a vertical door hinged to a wall edge at each end of the space bounded thereby, vertical partition-means traversing the gap between said walls to define in conjunction with said walls and doors a pair of vertical filtering chambers, a header-block extending horizontally over the upper ends of said chambers and having ya passage connecting a fluid-inlet port common to said chambers and a pair of transfer-ports whereby fluid may be transferred to said chambers, a valve controlling flow of fiuid through each of said transfer ports, extern ally-operable means for individual control of each of said valves, a headerblock extending horizontally across the lower ends of said chambers and having a passage connecting said lower ends to an outlet port, and a filter element in each of said chambers of such sizelas to be removable through an end of the aforesaid space when a door is swung about its hinge.

RICHARD SELIGMAN. HUGH FREDERICK GOODMAN.

(References on following page) The following references are of record in the' REFERENCES CITED file of this patent:

UNITED STATES PATENTS Number 5 Name Date Brown May 2, 1916 Konsalik July 5, 1921 Pette Aug. 5, 1924 Seligman Dec. 29, 1925 10 Lalor Dec. 13, 1927 Tnello Jan. 1 7, 1928 Scovlle Dec. 25, 1928 Hatch Mar. 3, 1931 Number Number 6 Name Date Garland et a1 July 12, 1932 Levinsen Aug. 30, 1932 Polushkin Nov. 1, 1932 Beck Aug. 25, 1942 Tauch Nov. 3, 1942 Widmann Nov. 2, 1943 Harvout Dec. 12, 1944 FOREIGN PATENTS Country Date France of 1908 Great Britain of 1923 

